<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div>
<form action="">
  <input type="text" name="name" /><br>
  Encryption:
  <keygen name="security" />    <!-- 加入密钥安全 -->
  <br><input type="submit" />
</form>
</div>
</body>
</html>